The trans modulator is of little concern here unless the vacuum line to it is leaking or the modulator will not hold a vacuum applied to it. I know of a blown T in my area where the cars idles at 2100 rpm - completely unmanageable.
Even with a blower, 1100 rpm idle is too much for a street car - checking again for vacuum leaks makes a lot of sense. Racing is one thing, but this can get pretty annoying if it is street car. If you absolutely can't get it to idle any lower than 1100 while stopped in gear, then maybe the next best solution is better brakes - again just treating the symptom.
The cure to this ever increasing stack of band-aids really involves lowering the idle. A higher stall also has the potential to run the trans temps up so upping the stall may generate another problem - to fix that you need a numerically higher rear end ratio so the converter 'locks up', but the higher ratio is bad for fuel consumption, and on and on. If you go with a higher stall and keep the idle at 1100 RPM, you will still be holding a lot of brake even if the converter is not stalled or nearly stalled. Putting in a higher stall converter may help the problem some, but it only treats the symptom. I agree with waykoe, the high idle speed is the primary problem.
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